Grate bar key for stokers feeding steam generator furnaces



FIG. 1 is a plan view of one form of the invention;

FIG. 2 is a bottom view of the embodiment of FIG. 1;

FIG. 3 is a left side view of the embodiment of FIG. 1;

FIG. 4 is a front view of the embodiment of FIG. 1;

FIG. 5 is a right side view of the embodiment of FIG. 1; and,

FIG. 6 is a sectional view taken along the line 6--6 of FIG. 1. 

The ornamental design for a grate bar key for stokers feeding steam generator furnaces, as shown and described. 